<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.6.10/vue.js"></script>
    <title>p59-60</title>
    <style>
        .ball{
            background-color: red;
            width: 15px;
            height: 15px;
            border-radius: 50%;
        }
    </style>
</head>
<body>
    <div id="app">
        <input type="button" value="加入购物车" @click="flag=!flag">
        <transition
        @before-enter="beforeEnter"
        @enter="enter"
        @after-enter="afterEnter"
        >
        <div class="ball" v-show="flag"></div>
        </transition>
    </div>
    <script>
        var vm=new Vue({
            el:"#app",
            data:{
                flag:false
            },
            methods:{
                beforeEnter(el){
                    el.style.transform="translate(0,0)";
                    el.style.opacity=1
                },
                enter(el,done){
                    el.offsetWidth;
                    el.style.opacity=0
                    el.style.transform="translate(150px,450px)";
                    el.style.transition="all ease 1s";
                    done();
                },
                afterEnter(el){
                    this.flag=!this.flag;
                    // el.style.opacity=0.2
                }
            },
            filters:{},
            directives:{},
            components:{}
        })
    </script>
</body>
</html>